Discontinuous Tension-Controlled Transition between Collective Actuations in Active Solids
Paul Baconnier1, Dor Shohat1,2, Olivier Dauchot1
1UMR CNRS Gulliver 7083, ESPCI Paris, PSL Research University, 75005 Paris, France.
Physical Review Letters
|January 27, 2023
Summary
Active solids, materials with self-propelling units, exhibit collective actuation. Mechanical tension controls actuation regimes and shows hysteresis, revealing selective material behaviors.
Area of Science:
- Materials Science
- Soft Matter Physics
- Biophysics
Background:
- Active solids, materials with embedded active units, offer potential for autonomous multifunctional materials.
- Understanding collective behaviors in these materials is crucial for both engineering and biological applications.
Purpose of the Study:
- To investigate a novel form of collective actuation in active solids.
- To explore the role of mechanical tension in controlling actuation regimes.
- To analyze the selectivity and hysteresis of collective actuations.
Main Methods:
- Experimental investigation of centimetric model active solids.
- Numerical simulations using an agent-based model.
- Theoretical analysis of mechanical tension effects.
Main Results:
- A new mechanism for collective actuation in active solids was identified.
- Mechanical tension was demonstrated as a general control parameter for actuation regimes.
- Hysteresis was observed, indicating non-trivial selectivity in collective responses.
Conclusions:
- Collective actuation in active solids can be controlled and tuned via mechanical tension.
- The observed hysteresis highlights the complex and selective nature of these active material systems.
- Findings advance the design principles for autonomous materials and understanding of dense biological systems.
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